From 2a3a59e5c977654d3aad5bc11cc0aca2303a7f44 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 11 Nov 2008 13:42:35 -0600 Subject: [SCSI] Fix hang in starved list processing Close possible infinite loop with interrupts off when devices are added back to the starved list. Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=11898 Reported-by: Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/scsi_lib.c | 23 +++++++++++------------ 1 file changed, 11 insertions(+), 12 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index f5d3b96890d..fa45a1a6686 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -567,15 +567,18 @@ static inline int scsi_host_is_busy(struct Scsi_Host *shost) */ static void scsi_run_queue(struct request_queue *q) { - struct scsi_device *starved_head = NULL, *sdev = q->queuedata; + struct scsi_device *sdev = q->queuedata; struct Scsi_Host *shost = sdev->host; + LIST_HEAD(starved_list); unsigned long flags; if (scsi_target(sdev)->single_lun) scsi_single_lun_run(sdev); spin_lock_irqsave(shost->host_lock, flags); - while (!list_empty(&shost->starved_list) && !scsi_host_is_busy(shost)) { + list_splice_init(&shost->starved_list, &starved_list); + + while (!list_empty(&starved_list)) { int flagset; /* @@ -588,24 +591,18 @@ static void scsi_run_queue(struct request_queue *q) * scsi_request_fn must get the host_lock before checking * or modifying starved_list or starved_entry. */ - sdev = list_entry(shost->starved_list.next, - struct scsi_device, starved_entry); - /* - * The *queue_ready functions can add a device back onto the - * starved list's tail, so we must check for a infinite loop. - */ - if (sdev == starved_head) + if (scsi_host_is_busy(shost)) break; - if (!starved_head) - starved_head = sdev; + sdev = list_entry(starved_list.next, + struct scsi_device, starved_entry); + list_del_init(&sdev->starved_entry); if (scsi_target_is_busy(scsi_target(sdev))) { list_move_tail(&sdev->starved_entry, &shost->starved_list); continue; } - list_del_init(&sdev->starved_entry); spin_unlock(shost->host_lock); spin_lock(sdev->request_queue->queue_lock); @@ -621,6 +618,8 @@ static void scsi_run_queue(struct request_queue *q) spin_lock(shost->host_lock); } + /* put any unprocessed entries back */ + list_splice(&starved_list, &shost->starved_list); spin_unlock_irqrestore(shost->host_lock, flags); blk_run_queue(q); -- cgit v1.2.3 From 8fbd64e2eeb81d4b94be935a15d6d4829ec62aa2 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 30 Nov 2008 10:15:37 -0600 Subject: [SCSI] aacraid: switch to block timeout aacraid updates the timeout in its slave configure routine if it is too small. This now needs to update the request queue timeout in block. Cc: AACRAID list Signed-off-by: James Bottomley --- drivers/scsi/aacraid/linit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c index 9aa301c1ed0..162cd927d94 100644 --- a/drivers/scsi/aacraid/linit.c +++ b/drivers/scsi/aacraid/linit.c @@ -427,8 +427,8 @@ static int aac_slave_configure(struct scsi_device *sdev) * Firmware has an individual device recovery time typically * of 35 seconds, give us a margin. */ - if (sdev->timeout < (45 * HZ)) - sdev->timeout = 45 * HZ; + if (sdev->request_queue->rq_timeout < (45 * HZ)) + blk_queue_rq_timeout(sdev->request_queue, 45*HZ); for (cid = 0; cid < aac->maximum_num_containers; ++cid) if (aac->fsa_dev[cid].valid) ++num_lsu; -- cgit v1.2.3 From 97b5648a8bc2aef980645ee39d31bba0933a6112 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 30 Nov 2008 10:20:37 -0600 Subject: [SCSI] ibmvscsi: switch to block timeout ibmvscsi sets the timeout in its slave configure routine for disk devices. This now needs to update the request queue timeout in block. Cc: Brian King Signed-off-by: James Bottomley --- drivers/scsi/ibmvscsi/ibmvscsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 87e09f35d3d..6cad1758243 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -1442,7 +1442,7 @@ static int ibmvscsi_slave_configure(struct scsi_device *sdev) spin_lock_irqsave(shost->host_lock, lock_flags); if (sdev->type == TYPE_DISK) { sdev->allow_restart = 1; - sdev->timeout = 60 * HZ; + blk_queue_rq_timeout(sdev->request_queue, 60 * HZ); } scsi_adjust_queue_depth(sdev, 0, shost->cmd_per_lun); spin_unlock_irqrestore(shost->host_lock, lock_flags); -- cgit v1.2.3 From ee1ab9e945803a607ba5c2a96b69e4820a806552 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 30 Nov 2008 10:27:51 -0600 Subject: [SCSI] megaraid_sas: switch to block timeout megaraid_sas sets the timeout in its slave configure routine for devices on special channels. This now needs to update the request queue timeout in block. Cc: "Yang, Bo" Signed-off-by: James Bottomley --- drivers/scsi/megaraid/megaraid_sas.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c index a454f94623d..17ce7abe17e 100644 --- a/drivers/scsi/megaraid/megaraid_sas.c +++ b/drivers/scsi/megaraid/megaraid_sas.c @@ -1016,7 +1016,8 @@ static int megasas_slave_configure(struct scsi_device *sdev) * The RAID firmware may require extended timeouts. */ if (sdev->channel >= MEGASAS_MAX_PD_CHANNELS) - sdev->timeout = MEGASAS_DEFAULT_CMD_TIMEOUT * HZ; + blk_queue_rq_timeout(sdev->request_queue, + MEGASAS_DEFAULT_CMD_TIMEOUT * HZ); return 0; } -- cgit v1.2.3 From 9728c0814ecb505546696a659858fdb761375544 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 30 Nov 2008 10:32:26 -0600 Subject: [SCSI] make scsi_eh_try_stu use block timeout scsi_eh_try_stu() was still using the timeout parameter in the device which is now not set (i.e. zero filled) meaning that it waited no time at all for the start unit command to complete (leading the routine to conclude failure every time). This lead to a 2.6.27 regression: http://bugzilla.kernel.org/show_bug.cgi?id=12120 Where firewire devices that were non spec compliant wouldn't spin up. Fix this by using the block queue timeout value instead. Reported-by: Stefan Richter Signed-off-by: James Bottomley --- drivers/scsi/scsi_error.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 386361778eb..edfaf241c5b 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -932,8 +932,7 @@ static int scsi_eh_try_stu(struct scsi_cmnd *scmd) int i, rtn = NEEDS_RETRY; for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) - rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, - scmd->device->timeout, 0); + rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); if (rtn == SUCCESS) return 0; -- cgit v1.2.3 From dc5c49bff34e5b5a4334560dc7f7dfeae91d8962 Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 30 Nov 2008 10:38:08 -0600 Subject: [SCSI] stex: switch to block timeout stex sets the timeout in its slave configure routine for all devices. This now needs to update the request queue timeout in block. Cc: Ed Lin Signed-off-by: James Bottomley --- drivers/scsi/stex.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c index 3790906a77d..2fa830c0be2 100644 --- a/drivers/scsi/stex.c +++ b/drivers/scsi/stex.c @@ -477,7 +477,7 @@ stex_slave_config(struct scsi_device *sdev) { sdev->use_10_for_rw = 1; sdev->use_10_for_ms = 1; - sdev->timeout = 60 * HZ; + blk_queue_rq_timeout(sdev->request_queue, 60 * HZ); sdev->tagged_supported = 1; return 0; -- cgit v1.2.3